> The darkness engulfs you as you enter the derelict. A strange sheen reveals the patterns on the oblong walls of the hallways. Your footsteps echo through the chambers, then... silence

Alien RPG is the tool for fans of the universe, with enough information to run any kind of campaign within the universe, whether it includes xenomorphs or not, giving plenty of opportunities for human conflict along the book to not tire the trope. It even solves many continuity problems in the franchise (like the retro tech in posterior missions). Fluff-wise, it is a pearl. Mind you, this lore includes all of the franchise, including the polemical Prometheus cycle. But even as I personally dislike them, I find interesting to have some variety to throw in the mix.

Now for the crunch, where a modified year zero engine makes a stellar aparition with the very interesting addition of stress as central mechanic. I love stress, it grants players more chances of success but also of failure, and the scenarios crescendo into panic attacks and chaos with the few stable minds rushing to survival. Now, for the stealth mechanics, while in paper they work a marvel, I feel they drag down the pace horribly, even for a terror atmosphere of slow crawls. I ended up skipping them altogether to keep my players engaged.

I haven't tried space combat nor campaign mechanics (only played self contained scenarios with loads of PC death), but what I read seems manageable and the campaign stuff includes enough content generation to keep it fresh while the GM develops an overarching plot.